Screening or separating machine.



I T. L. & T. J. STURTEVAN T. SCREENING 0R SEPARATING MACHINE. I APPLICATION FILED JUNE 10. I9I6- LQQQfiQQW Patented June 12, 1917.

2 SHEETS-SHEET l- T. L. 611. J. STURTEVANT. SCREENING 0R SEPARATING MACHINE.

V APPLICATION FILED JUNE 10, l9l6. 1 229, 0)9 Patented June 12, 1917.

2 SHEETS-SHEET 2.

To all whom it may concern:

Be it known that we, VANT and THoMAs' J. STURTEVANT, citizens of the United States, residing, respectively, at Quinc and Wellesle in the county of Norfolli and State of assachnsetts, have invented or discovered certain new and useful Improvements in Screening or Separating Machines, of which the following is a specification, reference. being had therein to the accompanying drawings. This invention relates to certain improvements in the screens or separators covered by the Sturtevant Patents No. 1,035,262, Aug. 13, 1912; No. 1,114,064., Oct. 20, 1914., and No. 1,116,512, Nov. 10, 1914; the present invention havin for its objectto increase the efficiency and convenience of the class of separators to which the said patents relate, as will hereinafter be fully set forth. In the accompanying drawings Figure 1 is a front view of the improved separator. Fig. 2 is a broken outside view thereof. *ig. 3 is a detail perspective view showing a preferred construction for removably attaching the sections of the screen box or casing together. Fig. 4 illustrates a removable half head for the feed box in elevation and in plan and edge views.

Referring to the drawings 12 denotes a screen box or casing su ported in an inclined position on a suita 1e frame-work 13, suitable means being provided whereby the inclination of the said box or casing may be varied as is sometimes desirable in working on difierent kinds of materials. In order to increase the capacit of the separator the box or casing is-pre erably made of greater height or length than heretofore, and for convenience in transportation is preferably made in two sections detachably secured together by means of angle-bars 14 riveted or otherwise permanently secured to the adja cent ends of the sections, the contiguous outwardly-projecting flange parts of the said angle-bars being joined by bolts 15 whichmay be removed when the sections are to be taken apart. Instead of these an= gle-bars 14 the screen box sections may be provided with integral outwardly-project ing flanges 14: detachably secured together by removable bolts 15.

Also in order to increase the eficiency of the se arator the feed box 16 is made somewhat onger than the width of the casing 12,

Specification of Letters Patent.

Application filed June 10, 1916. Serial Ito. 102,880.

THOMAS L. S U

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SCREENING 0R SEPARATING MACHHIE.

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and projects laterally beyond the said cas- 1ng at th that the matenal supplied to the said feed box through the hopper o ening 16 and fed to the screens will cover the entire width of the upper ends of the screens which was not e case in the former separators, in that the stream of material issuing from the feed box was not quite as wide as the screens. The rotary conveyer 17 in the feed box, and which feeds the material in said box to the screens, 15 also made longer than the width of the screens so thata stream of material fully as wide as the screens will be supplied thereto.

The rotary screw conveyer 17 is carried by a shaft 18 provided with a driving pulley 19, the said shaft having sald driving pulley a second and removably screens, within the box or casing 12, by perconvenience in placing the conveyer shaft 18 in working position or for removing it therefrom, the feed box is provided at one end with a removable or sliding portion 25 which, when thus enabling the conveyer shaft, when the pulley 20 has beenremoved, to be inserted in place from the top of the box, and then by a short endwise movement be brought fully into working position. If desired, however, the feed box 16 ma be provided at each end with a remova le or sliding portion 25, and in such case said shaft, with its attached conveyer, may be placed into or taken out of its working position, from the top of the box, without the necessity of removing the pulley 20.

In order to provide for a variable percussive action of the hammers 23 each of said hammers is preferably formed with a re pocket 26 adapted to receive c supply end of said feed box, so

at its end opposite v so great that comparatively the tops to, the bottoms of long screen boxes the speed of the descending material in the lower portions of the screen boxes would be little of the fine material would pass through the lower parts of the screens. To avoid this ob ection the fine mesh screens of the present improved separators are made in two parts so arranged that the material passing over an upper screen or screen section will be caused to pause in its descent before being delivered to a lower screen or screen section.

The material passing from the feed box 16 is first delivered onto a receivlng plate 27 preferably provided with a retarder 28, the material passing from plate 27 to a scalper screen the tailings of which are delivered to a tailings chute 30 which carries them The material passing through the scalper screen 29 is received on the upper fine screen section or screen 31, and the material passing over the said screen section or screen 31- is delivered to a shelf 32 above which 15 a depending retarding plate 33 which Wlll serve to check the downward travel of the material delivered from the screen 31 and cause it to drop onto the said shelf 32. From the shelf 32 the material is delivered to the lower fine screen section 34, and the tailings from the said screen section 34 are delivered outside of the screen box 12. The fine material passing through the screens 31 and 34 falls to the bottom of the screen .box and slides down the same to'a proper delivery opening. The imperforate tailings chute30, in the lower screen box section or unit, prevents any relatively coarse materlal from falling on the lower fine screen 34 below it, said screen 34 receiving material only from the screen 31.

From the foregoing it will be understood that the travel of the material passing down the fine screens will be interrupted at the lower end of the upper screen or screen section before being delivered to the lower screen or screen section, and thus the travel of the material over the lower screen section will not be more rapid than its travel over the upper screen section.

The percussively jarred fine screens 31 and 34 are supported by springs 35 beneath which are disposed stops 36 which will limit the downward movements of the screens under the jarring action of the posts 24 percussively acted on by the hammers 23.

For convenience in looking or reaching into the chamber of the screen box 12 said screen box is preferably provided at one or both sides with observation holes or hand holes 37 provided, in practice, with removable covers which may be taken off when desired. The lower observation hole is adjacent the receiving shelf 32 with which the retarder plate 33 cooperates, so that by lookthe said receiving out of the screen box.-

ing through said hole the operation of the retarder may be observed, and as the said retarder plate is of thin metal it may be bent slightly forward or backward (or up or down) to vary its working.

Each section of the screen box is provided with a hinged cover 38 supporting jarring mechanism or devices, and each section of the screen box contains its own screen or screens; so that the present improved separator may be said to contain a plurality of complete screen units adapted to be secured together or removed from each other, in that each unit has its own screen or screens and jarring devices. Thus, for convenience in transportation, the complete screen section units may be packed separately, and may be readily secured together in setting up the separator for use.

The frame-work 13,'by which the screen box or casing is adjustably supported in an inclined position, may, for affording adjustment, comprise horizontal bars having a jointed connection, as at 13 with the lower end of said box or casing, upright bars jointed at 13 to said horizontal bars, and adjustable connections between flanges 39 on the screen box or casing and the upper parts of said upright bars, the upper parts of said upright bars and the said flanges having holes 40 for the reception of removable pins or bolts 41 which may be placed in different holes in eflecting an adjustment of said screen box or casing in varying its angle of inclination. Of course .a proper looseness between the flanges 39 and the said upright bars will be provided to accommodate the varying positions of the screen box.

Having thus described our invention we claim and desire to secure by Letters Patent:

1. In a separator, a screen box or casing consisting of a plurality of sections detachably secured together, each section being provided with screens which are mounted for being percussively jarred, and each section being also provided with jarring mechanism for said screens, combined with a feed box which is a permanent part of the upper section or unit, a rotary conveyer mounted in said feed box, and a shaft by which said conveyer is carried and from which shaft the operating shafts, forming parts of the j arrin mechanisms of both of macaw ing plate for checking the downward travel of the material and diverting it to said shelf on which it is momentarily detained.

3. In a separator, the combination with an inclined screen box or casing and screens within the same, of a feed box arranged at the upper end of said casing and provided with a hopper opening near one end, the

said feed box extending laterally beyond said casing at its end, having the hopper opening, and a rotary conveyer within said feed box and of greater length than the width of said casing, the end of said conveyer, at the entering end of the material, extending laterally beyond the casing and being beneath said hopper opening.

5. In a separator, the combination with' an inclined screen box or casing, of separated screens'in the upper and lower portions of said casing, and retarding means between said screens for checking the descent of the material from the upper screen before the same is delivered to the lower screen, said retarding means comprising a shelf receiving material discharged from the upper screen and a depending retarding plate for checking the downward travel of the material and diverting it to said shelf, said box or'casing having in its side an observation hole adjacent said shelf so that the working of said retarding means may be observed from the outside of said box or casing V 6. In a separator, an inclined screen box or casing consisting of two sections or units detachably secured together, the? upper screen box section or unit being provided with a coarse or scalper screen and a fine screen below it, and the lower screen box section or unit being provided with a chute, to which the tailings from said coarse or scalper screen are delivered, and with a fine screen below the tailings chute and to which last-named fine screen material is delivered from said first-named fine screen.

7. In a separator, an inclined inclosed screen box or casing consisting of a plurality of sections or units detachably secured together, each section or unit being provided with its own screen or screens which are mounted for being percussively jarred, and each section or unit being provided with its own jarring mechanism, combined with a prime mover from which the said jarring mechanism of the said sections or units may be operated.

In testimony whereof we affix our signature's.

THOMAS l]. STURTEVANT- THOMAS JOSEPH STURTEVANT. 

